←Paper 4, Higher
Explain why transition metal compounds are used as catalysts and give an example.
Describe how to test for carbonate ions.
Describe how bioleaching extracts copper and one advantage of it.
Describe the structure and properties of carboxylic acids such as ethanoic acid.
Compare soda-lime glass and borosilicate glass.
A metal salt gives a blue precipitate with sodium hydroxide and a white precipitate with acidified barium chloride. Identify the salt and explain.
Write a half equation for the oxidation of magnesium atoms.
Describe how a condensation polymer such as a polyester is formed.
Explain why composites such as reinforced concrete are useful.
Describe the structure of DNA, proteins and starch as naturally occurring polymers.
Evaluate the use of plastic bags compared with paper bags using life cycle assessment.
Write the structural formula of propene and give the product when it reacts with hydrogen.
Explain why sustainable development is important in the chemical industry.
Describe the conditions used in fermentation to produce ethanol and why each is needed.
Explain why the reactivity of Group 1 metals increases down the group.
In paper chromatography, a spot moved 3.6 cm and the solvent moved 8.0 cm. Calculate the Rf value and explain how it could identify the substance.
Use collision theory to explain why increasing temperature increases the rate of reaction.
Explain what is meant by dynamic equilibrium.
Explain how iron is extracted from iron(III) oxide in a blast furnace and why carbon can be used.
Describe how crude oil is separated by fractional distillation.
Describe how the Earth's early atmosphere changed to form today's atmosphere.
Describe how potable water is produced from fresh water in the UK.
Describe what you would see when potassium is added to water and write a balanced equation.
In paper chromatography, a spot moved 2.1 cm and the solvent moved 7.0 cm. Calculate the Rf value and explain how it could identify the substance.
60 cm³ of gas was collected in 30 s. Calculate the mean rate of reaction.
N₂ + 3H₂ ⇌ 2NH₃ (forward reaction exothermic). Explain the effect on the yield of ammonia of increasing pressure and increasing temperature.
Explain why aluminium is extracted by electrolysis rather than reduction with carbon.
Explain why cracking is carried out.
Finished?
Answer every question to finish (28 left), or finish when the time’s up.
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This paper is written by Plasmo in the style of the OCR GCSE Chemistry exam. It is not a past paper and is not produced or endorsed by the exam board.